Malicious PDF — malware analysis report

Static analysis result for SHA-256 d849ad2fe42f8d5c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 13:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1459048c5621ec9385eed4fa94157f1 SHA-1: 0451eeec21e945b3131f7d7909a8bad56ec94ec7 SHA-256: d849ad2fe42f8d5c676a50bf5ba2a0df091c7540554027a35f901b4a453ccfe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, designed to redirect users to potentially malicious content. The presence of external URIs and link farms suggests an attempt to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vayoto.vn/userfiles/file/69497636324.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbfb78250---5195816600.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610a38bbe8c83---lupivameguju.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/64729151200.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/76732247909.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/14858064348.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1230e90bfb47fff10db242fcc411e934/nebuv.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/mqala2v3060a7n42hqj8b7sc05/zesulup.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/getakexadaxigo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3427ba35b---27503275403.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/jitaxujoxejawubabojuk.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf0bbb1d42---26242170919.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b743a9e0a2f9e237520555a9d3f830f3/dolosigifewaserif.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/84789770004.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c485fdc6d3---vapajej.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/83582695920.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/supukenazowexiso.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/54a08a118566731e139f146869f51dcf/zaxaxoxotezarofujipode.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/49528004313.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/9685002351.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/fugajogivedofogikivojal.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16071fcf1a6cf2---4868918936.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/turigunaronew.pdfIn PDF document text
    • http://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/77592431875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=liftmaster+garage+door+opener+manual+1d7675PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 17524 bytes
SHA-256: 7d709a1cc2bb22cbb390a382011fb8c46c93d0cb7a086358417692774c48da64
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 11304 bytes
SHA-256: 723c341e43473e0b3b84f0ca0c8a15121753670a6f45a706765a4b88d66f648d